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The RepRap Project is an initiative aimed at creating a largely self-replicating machine which can be used for rapid prototyping and manufacturing.
A rapid prototyper is a 3D printer that is able to fabricate three dimensional artifacts from a computer-based model. Project authors describe 'self-replication', understood as the ability to reproduce the components necessary to build another version of itself, as one of the goals for the project.
TL/DR: We make stuff that makes stuff.